class AddColunmComputer < ActiveRecord::Migration
  def self.up
    add_column :computers, :ram, :integer
    add_column :computers, :cpu, :integer
    add_column :computers, :hard_drive, :integer
    end
  
  def self.down
    remove_column :computers, ram
    remove_column :computers, cpu
    remove_column :computers, hard_drive
  end
end